.header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.add-book-link {
    color: #fff;
    font-weight: bold;
    text-decoration: none;
    margin-left: 10px;
}

#book-table {
    font-family: Arial, sans-serif;
    border-collapse: collapse;
    width: 100%;
}
#book-table th:first-child {
    text-align: center;
    width: 12%;
}

#book-table td, #book-table th {
    border: 1px solid #ddd;
    padding: 8px;
}

#book-table th {
    padding-top: 12px;
    padding-bottom: 12px;
    text-align: left;
    background-color: #f2f2f2;
    color: #333;
}

td {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.delete-form, .update-form {
    display: inline-block;
}

.delete-btn, .update-btn {
    margin: 0;
}

.book-btns {
    display: flex;
}

.delete-btn, .update-btn {
    background-color: #ee6058;
    border: none;
    color: white;
    padding: 10px 18px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    cursor: pointer;
}

.delete-btn {
    background-color: #fe6f63;
}

.update-btn {
    background-color: #7ce080;
}

.left-btn {
    margin-right: 5px;
}

.right-btn {
    margin-left: 5px;
}